Stems twining, terete, striate, internodes 10-12 cm. Petiole 0.5-1.5 cm, densely hirsute; leaf blade ovate-lanceolate, 4-8 × 2-3 cm, herbaceous, densely hirsute, base rounded to truncate, margin crenulate and ciliate, apex acuminate and caudate, veins 3. Inflorescences 1-flowered or cymes. Pedicel 1-4 cm, slender, sometimes sparsely hirsute. Calyx campanulate; tube 0.9-1.2 cm, entire or rarely split on 1 side; lobes lanceolate, 5-7 × 1-1.5 mm, apex acute. Corolla purple, campanulate, ca. 3.5 cm; lobes broadly triangular, oblique, ca. 2 × 4 mm, apex acute; plicae truncate, oblique, ca. 3 mm wide, margin crenulate. Stamens inserted just below middle of corolla tube; filaments linear-subulate, 1.1-1.3 cm; anthers ellipsoid, ca. 3 mm. Nectaries ovate. Style short, linear, ca. 7 mm including linear stigma lobes. Immature capsules ellipsoid, compressed, ca. 1.5 cm, included in corolla; gynophore ca. 1.3 cm. Fl. and fr. Aug-Oct.
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